package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;

    @Override
    public void removeCategory(Long categoryId) {
        //1. 注入所需的service
        //2. 查询该分类, 是否关联【菜品】
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, categoryId);
        int count1 = dishService.count(dishLambdaQueryWrapper);
        if (count1 > 0) {
            // 该分类下关联才【菜品】, 不能删除
            throw new CustomException("该分类下关联了菜品,不能删除");
        }

        //3. 查询该分类, 是否关联【套餐】
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, categoryId);
        int count2 = setmealService.count(setmealLambdaQueryWrapper);
        if (count2 > 0) {
            // 该分类下关联才【套餐】, 不能删除
            throw new CustomException("该分类下关联了套餐,不能删除");
        }

        //4. 可以正常删除
        removeById(categoryId);
    }


}
